<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <style type="text/css">
        #map {
            width: 512px;
            height: 512px;
            border: 1px solid black;
        }
    </style>
    <script src="lib/OpenLayers.js"></script>
    <script type="text/javascript">
        var box_extents = [
            [-10, 50, 5, 60],
            [-75, 41, -71, 44],
            [-122.6, 37.6, -122.3, 37.9],
            [10, 10, 20, 20]
        ];
        var map;
        function init(){
            map = new OpenLayers.Map('map');

            var ol_wms = new OpenLayers.Layer.WMS( "OpenLayers WMS", 
                "http://labs.metacarta.com/wms/vmap0?", {layers: 'basic'} );

            var boxes  = new OpenLayers.Layer.Boxes( "Boxes" );

            for (var i = 0; i < box_extents.length; i++) {
                ext = box_extents[i];
                bounds = new OpenLayers.Bounds(ext[0], ext[1], ext[2], ext[3]); 
                box = new OpenLayers.Marker.Box(bounds);
                box.events.register("click", box, function (e) {
                    this.setBorder("yellow");
                });
                boxes.addMarker(box);
            }

            map.addLayers([ol_wms, boxes]);
            map.addControl(new OpenLayers.Control.LayerSwitcher());
            map.zoomToMaxExtent();
        }
    </script>
  </head>
  <body onload="init()">
    <h1>OpenLayers Example</h1>
    <div id="map"></div>
  </body>
</html>
